G20 Parkinson disease

Incl.:

Hemiparkinsonism

Paralysis agitans

Parkinsonism or Parkinson disease:

• NOS
• idiopathic
• primary

G21 Secondary parkinsonism

G21.0 Malignant neuroleptic syndrome

Coding-Hint

Use additional external cause code (Chapter XX), if desired, to identify drug.

G21.1 Other drug-induced secondary parkinsonism

Coding-Hint

Use additional external cause code (Chapter XX), if desired, to identify drug.

G21.2 Secondary parkinsonism due to other external agents

Coding-Hint

Use additional external cause code (Chapter XX), if desired, to identify external agent.

G21.3 Postencephalitic parkinsonism

G21.4 Vascular parkinsonism

G21.8 Other secondary parkinsonism

G21.9 Secondary parkinsonism, unspecified

G22* Parkinsonism in diseases classified elsewhere

Incl.:

Syphilitic parkinsonism ( A52.1†)

G23 Other degenerative diseases of basal ganglia

G23.0 Hallervorden-Spatz disease

Incl.:

Pigmentary pallidal degeneration

G23.1 Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]

Incl.:

Progressive supranuclear palsy

G23.2 Multiple system atrophy, parkinsonian type [MSA-P]

G23.3 Multiple system atrophy, cerebellar type [MSA-C]

G23.8 Other specified degenerative diseases of basal ganglia

Incl.:

Calcification of basal ganglia

Neurogenic orthostatic hypotension [Shy-Drager]

Excl.:

orthostatic hypotension NOS ( I95.1)

G23.9 Degenerative disease of basal ganglia, unspecified

G24 Dystonia

Incl.:

dyskinesia

Excl.:

athetoid cerebral palsy ( G80.3)

G24.0 Drug-induced dystonia

Coding-Hint

Use additional external cause code (Chapter XX), if desired, to identify drug.

G24.1 Idiopathic familial dystonia

Incl.:

Idiopathic dystonia NOS

G24.2 Idiopathic nonfamilial dystonia

G24.3 Spasmodic torticollis

Excl.:

torticollis NOS ( M43.6)

G24.4 Idiopathic orofacial dystonia

Incl.:

Orofacial dyskinesia

G24.5 Blepharospasm

G24.8 Other dystonia

G24.9 Dystonia, unspecified

Incl.:

Dyskinesia NOS

G25 Other extrapyramidal and movement disorders

G25.0 Essential tremor

Incl.:

Familial tremor

Excl.:

tremor NOS ( R25.1)

G25.1 Drug-induced tremor

Coding-Hint

Use additional external cause code (Chapter XX), if desired, to identify drug.

G25.2 Other specified forms of tremor

Incl.:

Intention tremor

G25.3 Myoclonus

Incl.:

Drug-induced myoclonus

Coding-Hint

Use additional external cause code (Chapter XX), if desired, to identify drug, if drug-induced.

Excl.:

facial myokymia ( G51.4)

myoclonic epilepsy ( G40.-)

G25.4 Drug-induced chorea

Coding-Hint

Use additional external cause code (Chapter XX), if desired, to identify drug.

G25.5 Other chorea

Incl.:

Chorea NOS

Excl.:

chorea NOS with heart involvement ( I02.0)

Huntington chorea ( G10)

rheumatic chorea ( I02.-)

Sydenham chorea ( I02.-)

G25.6 Drug-induced tics and other tics of organic origin

Coding-Hint

Use additional external cause code (Chapter XX), if desired, to identify drug, if drug-induced.

Excl.:

de la Tourette syndrome ( F95.2)

tic NOS ( F95.9)

G25.8 Other specified extrapyramidal and movement disorders

Incl.:

Akathisia (drug-induced) (treatment-induced)

Restless legs syndrome

Stiff-man syndrome

Coding-Hint

Use additional external cause code (Chapter XX), if desired, to identify drug, if drug-induced

G25.9 Extrapyramidal and movement disorder, unspecified

G26* Extrapyramidal and movement disorders in diseases classified elsewhere